Answer:
The ribosomes of the endoplasmic reticulum.
Step-by-step explanation:
The endomembrane system in eukaryotic organism divides the cell organelles into structural and functional compartment. The endomembrane system is important in the process of protein processing and secretion.
The production of insulin in the cells follows the proper pathway of the protein secretion. The protein insulin has been released out of the cell, the endoplasmic reticulum ribosomes are involved in its production.